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Real Name: Cain Marko
First Appearance: Survival Of The Fittest
Voice: Chiara Zanni
An all-powerful brute, Juggernaut is the half brother of Xavier. When he became too strong and too vengeful to live amongst normal people, Xavier had him detained in a maximum security prison which held him underwater and left him in a state of permanent sleep.

Mystique freed him in hopes of getting him to steal Cerebro from Xavier but he was defeated by a combined effort by The X-Men and The Brotherhood.

He was once again freed by Mystique and she placed Xavier in his containment tank. After creating havoc in Michigan, he was stopped by The X-Men. He managed to escape being captured and was never heard from again.